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t e e h S uw e e h S 2 N O S Dru. E D N A S P.. u d 0 M o /N\ DUUR BELL.

No. 886,164. `Patented July 17,1888.

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2 Sheets- Sheet 2.

(No Model.)

F. SANDBRSON.

DOOR BELL.

110.386,164. Patented July 17, 1888.

UNITED STATES FREDERICK SANDERSON, OF PROSPECT PARK, ILLINOIS.

DOOR-BELL.

SPECIFICATIGN 'forming part of Letters Patent No. 386,164, dated July17, 1888.

(No model.)

To all whom, it may concern:

Be it known that I, FREDERICK SANDERsoN, a citizen of the United States,residing at Pros pect Park, in the State of Illinois, have inventedcertain new and useful Improvements in Alarm or Call Bells, of which thefollowing is a specification, to wit:

This invention relates to an improvement in alarnrbells; and it consistsin certain peculiarities of the construction and arrangement ofthe same,substantially as will be hereinafter more fully described and claimed.

In order to enable others skilled in the art to make and use myinvention, I will now proceed to describe its construction andoperation, referring to the accompanying drawings, in which- Figure lrepresents a face view of an imitation electric doorbell, and Fig. 2 avertical sectional View of the same. Fig. 3 is a section, and Fig. 4 aside elevation, of a clock-escapement of the ordinary kind in which myimprovement is applied.

a represents the base-plate, upon which is secured a bell, a', and theoperative mechanism of a door bell or alarm of the variety designed toproduce a close imitation of the electric bell. The mechanism hereinshown consistsofreciprocat-ing rackbarb,sliding through openings b inthe plate and casing, and provided with a spring, b2, to return it topiace after being pushed by the ringer. This rackbar engages a pinion orlantern wheel, c, secured upon the side of, or upon the same shaft with,a gear, c', which in turn engages and drives a second pinion or lanternWheel, ci, and with it a wheel, d, which is in Fig. l shown as formedwith a peripheral cam-groove, d.

In suitable bearings I journal a rock-shaft, e, from one side of whichprojects a short arm, e', which engages the cam-groove d', and from theopposite side projects the hammer e2, as in Fig. 2. y

A hole, f, is bored through the door or frame f, to which the bell is t0be attached, and the end of the rack-bar and its spring are allowed toproject therein. It will be noted that the main base-plate a is cast orformed with a iange or nipple, a2, which is beveled on its outer side,and serves to center the rack-bar in the hole formed to receive it, asthe plate will readily adjust itself as it is placed against the doorwith its beveled nipple projecting into the hole j, as indicated in Fig.2. Upon the outside ofthe door or frame j" is secured the casting g forthe pushbutton, formed with a projecting beveled guide, g, which centersitself in the outer end of the holef, and in which is held the buttong2, formed with a head or iange on its inner end to prevent its beingforced out too far. A connecting wire or rod, h, is socketed into thebutton nearly to its outer end, as shown, in order that this rod may beheld tirmly and directly in line, and also that the force of thepressure may act at the outer face of the button and have no tendency towabble when pressed in. The connecting wire is cut of a length to fitthe holef, and has its inner end socketed into the rackbar, as shown indotted lines in the drawings.

It will be noticed that the opening b in the base-plate, through whichthe rack-bar passes, has its upper outer edge and lower inner edgebeveled oii to admit of the insertion of said rack-bar and the passageof its end beneath the pinion till its teeth can be engaged.

In use this bell is set up as herein shown, and a push upon the buttonforces in the rackbar, and by means of the gearing and camwheel impartsto the hammer a series of rapid vibrations, which produce upon the bella close imitation of an electric alarm. Vhen the pressure is released,the spring returns the parts to their normal position; and if the springis made of sufficient strength this reaction will be rapid enough toagain produce the rapid strokes upon the bell. nection I would callattention to the peculiar excellence of the cam-wheel for actuating thehammer, as it is exactly the same in its action, no mattei' whichdirection it may be moved, and I am thus enabled to dispense with theratchet and pawl usually used in connection with escapement or palletwheels in similar mechanism. The cam-wheel need not necessarily be madeas described, nor is it limited to door-bells. Thus in Figs. 8 and 4 Ihave shown it appliedto an ordinary spring alarm, such as is common inalarm-clocks. In this case instead of forming the wheel with a camgrooveI have stamped it out of sheet metal, with a wavy or zigzag edge,produced by press- In this con- IOL) ing the body of the sheet out ofline to the required angle, and the hammer, instead of being aspreviouslyshown, is provided with a fork, as at m, to engage the cam m',as clearly seen in Fig. 4. It will thus be seen that the cam is readilyapplicable to any purpose in which a bell hammer is to be vibrated, andwill act the same in either direction.

For easier and more accurate operation, the yoke or fork which engagesthe stamped cam is pivoted upon the end of the bell-hammer and moveseasilyin rounding the corners ofthe zigzag edge of the cam.

The rack-bar is not ofnecessity formed square in section, as shown, butis preferably made round, the teeth formed upon it serving to keep itfrom turning and in proper position for operation.

Having thus fully described my invention, what I claim as new, anddesire to secure by Letters Patent, is-

1. In an alarm or call bell, the combination, with the bell and itsvibrating hammer having a forked end and a train of actuating-gearing,of a cam-wheel interposed between them formed of a single piece of sheetmetal stamped or pressed to proper form, substantially as and for thepurpose set forth.

2. In an alarm or call bell, the combination, with the bell-strikingmechanism and an actuating rod or-button for connection with the samethrough a door or frame, of a base-plate upon which said bell mechanismis secured,

saaie/it provided with openings for the passage ofthe actuating-rod, andformed with a circular beveled projection or flange to aid in centeringthe opening in the plate with that in the door or frame through whichthe actuatingrod is passed, substantially as and for the purpose setforth.

3. In an alarm or call bell, the combination, with the bell mechanismadapted to be secured upon one side of a door or frame, and aconmeeting-rod for passing through said door or frame, of a push-buttonformed with a socket to receive said rod nearly to the forward side ofthe button, whereby side draft and friction are avoided when thepressure is applied, substantially as and for the purpose set forth.

4. The combination, with a bell mechanism secured upon one side of adoor or frame, of a push-button for operating the bell, secured upon theopposite side of said door or frame, and connected through the same by acon necting-rod with the bell mechanism, said button having its frame gformed with a projecting beveled guide, g', to aid in centering it withthe opening in said door or frame, and prevent binding of the operativeparts, substantially as shown, and for the purpose set forth.

In testimony whereof I affix my signaturein presence of two witnesses.

` FREDERlCK SANDERSON. Witnesses :P

W. C. MCARTHUR, W S. MCARTHUR.

